# std::atomic_flag::test

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< cpp‎ | atomic‎ | atomic flag

bool test( std::memory_order order = std::memory_order_seq_cst ) const volatile noexcept; | (1) | (since C++20)
bool test( std::memory_order order = std::memory_order_seq_cst ) const noexcept; | (2) | (since C++20)

Atomically reads the value of the *this and returns the value.

If order is one of std::memory_order_release and std::memory_order_acq_rel, the behavior is undefined.

### Parameters

order | - | the memory synchronization ordering

### Return value

The value atomically read.

### Example

| This section is incomplete Reason: no example

### See also

atomic_flag_testatomic_flag_test_explicit (C++20)(C++20) | atomically returns the value of the flag (function)

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